Punch holder for double-blow heading machines



April 23, 1929. J. E. PRACNY 7 1,709,876

I PUNCH HOLDER FOR DOUBLE BLOW HEADING MACHINES I Filed Aug. 15. 1927 2 Sheets-Sheet 1 VQM/NI Z/YTOF W x jg April 23, 1929. J. E. PRACNY PUNCH HOLDER FOR DOUBLE BLOW HEADING MACHINES Filed Aug. 15, 1927 2 Sheets-Sheet 2 um m k Patented Apr. 23, 1929.

- UNITEDYSTATE'S- JOHN E, PRACNY, or WAT'ERBURY, comvnc'rroor, AssIe-Non T0 THEE. J; MA VILLE MACHINE COMPANY, or WATERBURY, NECTICUT.

TE OFFICE, I

CONNECTICUT, A'conronarron or Con-e i PUNCH-I HOLDER FOR DOUBLE-BLOW HEADING MACHINES.

Application filed August 15, 1927. Serial No. 212,984.

This invention relates to thosefmachines for heading cold fmetal stock, such as slugs cut from wire or rod, having two punches, each of which acts upon the stock during each cycle of the machine operations. In such machines the punches are arranged one above the-other so as to reciprocate longitudinally and also to move transversely and be alternately brought into line with the die for acting upon the stock. To accomplish this the punches are mounted on a slide that by suitable mechanism is given a ver tical movement in the end of a gate which by suitable mechanism is given a horizontal reciprocation, the operating mechanisms beingtimed so thatrduring the return reciprocatory movements of the gate and punches the position of the slide is changed and the elevations .of the punches altered to bring first one into line with the die and then the other into line with the die. The vertically movable slide, of course, must have aworking fit in the end of the gate, that is, a fit with sufficient clearance to permit it to slide up and down freely, and there is a considerable distance between the back of this slide and the faces of the punches. Frequently the end of the stock, is not cut off square or smooth so as to be parallel with the faces of the punches, in which case there is resistance which tends to force the punches sidewise as they strike the stock. Such an action causes sidewis'e strain on the slide which results in excess friction and undue wear on the slide and theiways in which it moves, besides resulting in an imperfect product. v

The object of this invention is to so construct the punch supporting parts of a cold heading machine which is designed to act rapidly and strike two blows upon a piece of stock, that the sidewise effector whipping action of the vertical movable slide is practically eliminated, whereby the moving parts will operate more freely, have a longer life and produce a more uniformly perfect product than the prior headers of this type.

In the embodiment of the invention-illustrated this object is attained by fastening a hardened plate between the front face of the vertically movable slide and the punch holder block, and extending this plate to one side and fitting its projecting edge into a guide- Way formed between the front end-of the gate anda gib thatis fastened to the gate, thus providing a guideway independent'of the regular gate guideway which v,resistsjany tendency of the slide to whip under sidewise strains on the faces of the punches. I In the accompanying drawings Fig. 1

shows a vertical section of the gate,vslide,

punch holder and .somuch of the mechanism for reciprocating thegate and raising'and lowering the slide of a well known double blow solid die cold heading machine, as is necessary to an understanding of the present invention. Fig. 2 is a plan oflthe parts shown in Fig. 1. Fig. 3 is, on larger scale, a front elevation of the slide and punches and the means for raising and lowering the slide. Fig. 4 isa plan ofthe'parts shown inFig.3. I Y

lhe gate 1 is reciprocated; longitudinally in'ways in the frame 2 by the crank itand crank rod 4 inthe manner usual in machines of this character, The transfer slide 5 is fitted in a dove-tail way 6 in the front end of the gate so as to be reciprocated horizonof the slide is effected so that first one punch and then the other punch Will be brought into line with the die12 for acting stock.

In carrying out the object of this invention the intermediate or hardened backing plate 8 is extended to one side for practically its entire length providing a wing 13, and the end of the gate is provided with a forward extension 14:. Fastened to this extension 14 is a gib 15, and the extended side edge or wing of the plate has an operative fit in the opening provided by this extension of the gate'and the gib. As a result of this construction the transfer slide, carrying the plate, punch block and punches, travels back upon the Y and forth horizontally with the gate and i has afree vertical movement at the proper times, being retalned in such a manner that 7 any tendency of the vpunches to slide side- 1. In a machine for swaglng cold metal stock, the combination with a horizontally movable gate and a slide carrying a plurality of punches fitted into a way in the gate so as to travel horizontally with but have a vertical movement independent of the gate,

of means extending to one side from the front face of the slide into a way at the end of the gate for resisting sidewise strams on the slide incident. to the action of the punches on the stock.

' 2. In a machine for swaging cold metal stock,'thc combination with a horizontally movable gate and a slide carrying a plurality of punches fitted into a dovetailed way in the gate so as to travel horizontally with but have a vertical movement independent of the gate, of means extending to one side from the slide into a [Way independent of the dovetailed way, at the end of the gate for resisting sidewise strains on the slide incident to the action of the punches on the stock.

3. In a machine for swaging cold metal stock, the combination with a horizontally movable gate and a slide carrying a plurality of punches fitted into a Way in the gate so as to travel horizontally with but have i a vertical movementindependent of the gate, ofa plate attached to and extending sidewise beyond the slide into a way at the end of the gate for resisting ,sidewise strains on the slide incident to the action ofthe punches on the stock. I

,4. In a machine for s'waging cold metal stock, the combination with a horizontally inovablegate and a slide carrying a pluralityof punches, fitted into a way in the gate so as to travel horizontally with but have a vertical movement independent of the gate,

of a plate attached to and extending sidewise beyondthc slide, and a gib attached to the gate and engaging the edge of the plate for resisting sidewise strains on the slide incident to the action of the punches on the stoc 1.

5. In a machine for swaging cold metal g stock, the combination With -a horizontally movable gate, of a slide carrying a plate and a punch block adapted to hold a plurality'of punches, said slide being fitted into a dovetailed way in the gate so as to travel horizontally with but have a vertical movement independent of the gate, said plate extending from one side of the slide into a Way at the end of the gate and independ ent of said dovetailed way for resisting sidewise strains on the slide incident to the action of the punches on the'stock.

JOHN E. PRACNY. 

